German authorities were warned days before MH17 was shot down of the danger to civilian aircraft in east Ukraine.(Reuters)

Russian arms manufacturer Almaz Antey claims that an older version of the Buk surface-to-air missile found in Ukrainian but not Russian military arsenals downed flight MH17 over east Ukraine.

Mikhail Malyshevsky, adviser to the director general of the state-owned arms consortium, said that the conclusion had been formed by company experts after studying photographs of debris from the crash site.

The plane was downed in July 2014, killing all 298 people on board.

The West accused militias battling Ukrainian government forces in east Ukraine of downing the plane used a Buk missile provided by the Russian military.

BUK missile system(Александр Сигачёв)

Moscow denies the allegations, and has accused Ukrainian forces of shooting down the Malaysian Airlines plane, which was flying from Amsterdam to Kuala Lumpur.